Storm overflow register · 2025 annual return

Southern Water storm overflows, 2025

Southern Water reported 977 storm overflows in England for 2025. Together they recorded 15,554 spills over 114,868 hours, an average of 15.9 spills per overflow against 20.4 across England. That ranks 4 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 47% on 2024.

175 overflows did not spill · 42 spilled more than 60 times · 862 had monitors working for 90% of the year or more · 215 sewage treatment works with overflows

Hours spilling by month, 2025

Hours spilling, all Southern Water overflows, from the start/stop records. Spills running across a month end are split between the months.

All Southern Water storm overflows

Sorted by hours spilling. Open an overflow for its permit, location, reasons for high spills and improvement status.

Overflow	Discharges to	Spills 2025	Hours 2025	Spills vs 2024	Monitor uptime
Latimer Road St Helens Ceo Storm discharge at pumping station Company site name LATIMER ROAD ST HELENS CEO - 108535 EA ID / permit SWS00494 · A01416 Outlet location SZ6313088670 (OS grid reference) · View on Apple Maps WFD catchment Old Mill Ponds (GB560710116900) Bathing water Bembridge; St Helens; Seagrove Shellfish water Ryde 2024 spills / hours 4 / 4.1 Long-term average 2.9 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.6 hours spilling →	River Yar	1	0.6	down 75%	100%
Cow Lane Portchester Ceo Storm discharge at pumping station Company site name COW LANE PORTCHESTER CEO - 108419 EA ID / permit SWS00211 · A01383 Outlet location SU6226005190 (OS grid reference) · View on Apple Maps WFD catchment PORTSMOUTH HARBOUR (GB580705140000) Shellfish water Portsmouth Harbour 2024 spills / hours 1 / 0.9 Long-term average 17.1 spills a year (monitored since 2016) Investigation UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 0.6 hours spilling →	Portsmouth Harbour	1	0.6	no change	100%
Lymington Slipway Pennington CSO Overflow on sewer network Company site name LYMINGTON SLIPWAY PENNINGTON CSO - 108453 EA ID / permit SWS00531 · A01225 Outlet location SZ3280095610 (OS grid reference) · View on Apple Maps WFD catchment LYMINGTON (GB520704202100) Shellfish water Lymington and Sowley; Pennington 2024 spills / hours 3 / 6.5 Long-term average 5.7 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.6 hours spilling →	Lymington River Estuary	2	0.6	down 33%	100%
Mill Green Road Haywards Overflow on sewer network Company site name MILL GREEN ROAD HAYWARDS HEATH CSO - 108287 EA ID / permit SWS00569 · A00956 Outlet location TQ3314024960 (OS grid reference) · View on Apple Maps WFD catchment Scrase Bridge Stream at Haywards Heath (GB107041012680) 2024 spills / hours 9 / 25 Long-term average 7.2 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 0.6 hours spilling →	Scrase Bridge Stream	2	0.6	down 78%	100%
Seaton Road Gillingham CSO Overflow on sewer network Company site name SEATON ROAD GILLINGHAM CSO - 103209 EA ID / permit SWS00757 · Permit applied for Outlet location TQ7889969128 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 1 / 0.3 Long-term average 5.0 spills a year (monitored since 2023) Monitor below 90% Sensor failure / issue · Resolved - Nov Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.6 hours spilling →	River Medway Estuary	1	0.6	no change	19%
Wickham Road Fareham CSO Storm discharge at pumping station Company site name WICKHAM ROAD FAREHAM CSO - 111249 EA ID / permit SWS00943 · A01453 Outlet location SU5833006710 (OS grid reference) · View on Apple Maps WFD catchment R. Wallington (GB107042016360) Shellfish water Portsmouth Harbour 2024 spills / hours 7 / 20 Long-term average 5.0 spills a year (monitored since 2016) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 0.6 hours spilling →	River Wallington	2	0.6	down 71%	100%
Marsh Lane Cliffe Ceo Storm discharge at pumping station Company site name MARSH LANE CLIFFE CEO - 108607 EA ID / permit SWS00555 · A01337 Outlet location TQ7387076840 (OS grid reference) · View on Apple Maps WFD catchment Higham Marshes (GB560604017600) 2024 spills / hours 2 / 25 Long-term average 1.6 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	A Tributary of Cliffe Creek	1	0.5	down 50%	100%
Bridge Road Lymington CSO Overflow on sewer network Company site name BRIDGE ROAD SCREEN LYMINGTON CSO - 101813 EA ID / permit SWS00094 · A00359 Outlet location SZ3273096040 (OS grid reference) · View on Apple Maps WFD catchment Lymington River (GB107042011220) Shellfish water Lymington and Sowley; Pennington 2024 spills / hours 0 / 0.0 Long-term average 1.2 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Lymington River	1	0.5	up from 0	100%
Friars Walk Barton-on-Sea CSO Overflow on sewer network Company site name FRIARS WALK BARTON ON SEA CSO - 108432 EA ID / permit SWS00335 · A01355 Outlet location SZ2410093850 (OS grid reference) · View on Apple Maps WFD catchment Becton Bunny (GB107042011260) Bathing water Christchurch Bay 2024 spills / hours 0 / 0.0 Long-term average 0.3 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Becton Bunny	2	0.5	up from 0	99%
Harbour Road Gosport Ceo Storm discharge at pumping station Company site name HARBOUR ROAD GOSPORT CSO - 108438 EA ID / permit SWS00397 · A01365 Outlet location SU6206000120 (OS grid reference) · View on Apple Maps WFD catchment PORTSMOUTH HARBOUR (GB580705140000) Bathing water Southsea East; Stokes Bay Shellfish water Central Solent; Portsmouth Harbour; Ryde; Spithead and Stokes Bay 2024 spills / hours 1 / 0.4 Long-term average 0.6 spills a year (monitored since 2016) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Portsmouth Harbour	1	0.5	no change	100%
Alexandra Road Hythe CSO Overflow on sewer network Company site name ALEXANDRA ROAD HYTHE H CSO - 108390 EA ID / permit SWS00013 · NPSWQD011004 Outlet location SU4250008010 (OS grid reference) · View on Apple Maps WFD catchment SOUTHAMPTON WATER (GB520704202800) Shellfish water Southampton Water; Approaches to Southampton Water 2024 spills / hours 3 / 2.9 Long-term average 3.6 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Southampton Water	3	0.5	no change	100%
Hobbs Cottage CSO, Climping Street Storm discharge at pumping station Company site name HOBBS COTTAGE CLIMPING CEO - 108034 EA ID / permit SWS00437 · A01177 Outlet location TQ0026001210 (OS grid reference) · View on Apple Maps WFD catchment Ryebank Rife (GB107041006620) Bathing water Littlehampton; Middleton-on-sea 2024 spills / hours 8 / 60 Long-term average 1.2 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Ryebank Rife via Surface Sewer	1	0.5	down 88%	97%
Kirtley Close Drayton CSO Overflow on sewer network Company site name KIRTLEY CLOSE DRAYTON CSO - 108774 EA ID / permit SWS00483 · A01387 Outlet location SU6716004640 (OS grid reference) · View on Apple Maps WFD catchment LANGSTONE HARBOUR (GB580705130000) Shellfish water Chichester Harbour (Emsworth Channel); Langstone Harbour; Portsmouth Harbour 2024 spills / hours 6 / 10 Long-term average 7.0 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 0.5 hours spilling →	Langstone Harbour	2	0.5	down 67%	100%
St Mildred'S Bay CSO Overflow on sewer network Company site name ST MILDREDS BAY CSO - 107371 EA ID / permit SWS00819 · A00780 Outlet location TR3277070430 (OS grid reference) · View on Apple Maps WFD catchment Kent North (GB650704510000) Bathing water Margate Fulsam Rock; Margate The Bay; St Mildred's Bay, Westgate; Walpole Bay, Margate; West Bay, Westgate; Westbrook Bay, Margate Shellfish water Margate 2024 spills / hours 1 / 0.2 Long-term average 0.2 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Controlled Sea	1	0.5	no change	100%
King Street Maidstone CSO Overflow on sewer network Company site name KING STREET MAIDSTONE CSO - 108663 EA ID / permit SWS00473 · A00904 Outlet location TQ7634055620 (OS grid reference) · View on Apple Maps WFD catchment Len (GB106040018430) 2024 spills / hours 0 / 0.0 Long-term average 1.6 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	The River Len	3	0.5	up from 0	99%
Kingsbarn Lane Pumping Station Storm discharge at pumping station Company site name KINGS BARN LANE STEYNING CEO - 108269 EA ID / permit SWS00479 · A00290 Outlet location TQ1850011600 (OS grid reference) · View on Apple Maps WFD catchment Black Sewer (GB107041012040) 2024 spills / hours 4 / 7.8 Long-term average 3.7 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Freshwater River	1	0.5	down 75%	100%
Fishmarket Road Rye CSO Overflow on sewer network Company site name FISHMARKET ROAD RYE CEO - 108216 EA ID / permit SWS00315 · A01463 Outlet location TQ9240020570 (OS grid reference) · View on Apple Maps WFD catchment ROTHER (GB540704016100) 2024 spills / hours 1 / 0.3 Long-term average 1.4 spills a year (monitored since 2018) Monitor below 90% Sensor failure / issue · Resolved - Oct Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	The River Rother	1	0.4	no change	23%
Salterns Wps CSO Storm discharge at pumping station Company site name SALTERNS ROAD SEAVIEW CEO - 107411 EA ID / permit SWS00735 · A00765 Outlet location SZ6259091750 (OS grid reference) · View on Apple Maps WFD catchment Solent (GB650705150000) Bathing water Ryde; Seagrove; St Helens Shellfish water Ryde; Spithead and Stokes Bay 2024 spills / hours 4 / 17 Long-term average 5.1 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	The Solent	1	0.4	down 75%	100%
Blackmores Farm CSO Overflow on sewer network Company site name BLACKMORES FARM WIVELSFIELD CSO - 108190 EA ID / permit SWS00071 · W00446 Outlet location TQ3417020330 (OS grid reference) · View on Apple Maps WFD catchment R. Adur East (GB107041012220) 2024 spills / hours 3 / 11 Long-term average 0.8 spills a year (monitored since 2019) Monitor below 90% Sensor failure / issue · Resolved - Sep Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	Freshwater River	1	0.4	down 67%	86%
Frindsbury Road Strood CSO Overflow on sewer network Company site name FRINDSBURY ROAD STROOD CSO - 108637 EA ID / permit SWS00336 · EPR/HB3495RM Outlet location TQ7420069310 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 0 / 0.0 Long-term average 0.8 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	Medway Estuary	3	0.4	up from 0	93%
Gruneison Road Storm PS Overflow on sewer network Company site name NEWCOMEN ROAD PORTSMOUTH CSO - 108460 EA ID / permit SWS00377 · W00279 Outlet location SU6407002560 (OS grid reference) · View on Apple Maps WFD catchment PORTSMOUTH HARBOUR (GB580705140000) Bathing water Southsea East; Stokes Bay Shellfish water Portsmouth Harbour; Spithead and Stokes Bay 2024 spills / hours 2 / 2.3 Long-term average 1.9 spills a year (monitored since 2016) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 0.4 hours spilling →	Portsmouth Harbour	1	0.4	down 50%	100%
Tanyard Lane Southborough CSO Overflow on sewer network Company site name TANYARD LANE SOUTHBOROUGH CSO - 115160 EA ID / permit SWS00849 · Permit applied for Outlet location TQ5743142232 (OS grid reference) · View on Apple Maps WFD catchment Barden Mill Stream (GB106040018100) 2024 spills / hours 1 / 0.4 Long-term average 1.0 spills a year (monitored since 2023) Monitor below 90% Sensor failure / issue · Resolved - Jul Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 0.4 hours spilling →	Barden Mill Stream	1	0.4	no change	49%
Broadstairs Headworks Storm discharge at pumping station Company site name BROADSTAIRS WORKS UNSCREENED CEO - 116072 EA ID / permit SWS00107 · A01214 Outlet location TR4335071210 (OS grid reference) · View on Apple Maps WFD catchment Kent North (GB650704510000) Bathing water Botany Bay, Broadstairs; Broadstairs, Stone Bay; Joss Bay, Broadstairs; Broadstairs, Viking Bay Shellfish water Margate 2024 spills / hours 0 / 0.0 Long-term average 0.3 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	The English Channel	1	0.4	up from 0	100%
Roedean Close Bexhill CSO Overflow on sewer network Company site name ROEDEAN CLOSE BEXHILL CSO - 109511 EA ID / permit SWS00715 · A01264 Outlet location TQ7307008190 (OS grid reference) · View on Apple Maps WFD catchment East Stream (GB107041012430) Bathing water Bexhill 2024 spills / hours 0 / 0.0 Long-term average 0.2 spills a year (monitored since 2016) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	Ditch to English Channel	1	0.4	up from 0	100%
Ivyarch Road PS Storm discharge at pumping station Company site name IVY ARCH ROAD WORTHING CSO - 108262 EA ID / permit SWS00465 · A00960 Outlet location TQ1499003470 (OS grid reference) · View on Apple Maps WFD catchment Teville Stream (GB107041011940) Bathing water Lancing, Beach Green; Worthing; Worthing Beach House 2024 spills / hours 0 / 0.0 Long-term average 0.4 spills a year (monitored since 2016) Monitor below 90% Telemetry or data archiving failure / issue · Resolved - May Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	Freshwater River	1	0.3	up from 0	81%
Floating Bridge Cowes CSO Overflow on sewer network Company site name FLOATING BRIDGE COWES CSO - 109300 EA ID / permit SWS00319 · A01455 Outlet location SZ5014095560 (OS grid reference) · View on Apple Maps WFD catchment MEDINA (GB520710101600) Bathing water Cowes; Gurnard Shellfish water Central Solent; Cowes and Medina; Spithead and Stokes Bay; Stanswood Bay 2024 spills / hours 10 / 9.4 Long-term average 2.0 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	River Medina	3	0.3	down 70%	100%
Beach Lane Netley Ceo Storm discharge at pumping station Company site name BEACH LANE NETLEY CEO - 108827 EA ID / permit SWS00047 · A01419 Outlet location SU4506008350 (OS grid reference) · View on Apple Maps WFD catchment SOUTHAMPTON WATER (GB520704202800) Shellfish water Southampton Water; Approaches to Southampton Water 2024 spills / hours 2 / 5.8 Long-term average 0.7 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	Southampton Water	1	0.3	down 50%	91%
Walderslade Road Chatham 149 CSO Overflow on sewer network Company site name WALDERSLADE ROAD CHATHAM OUTSIDE 149 CSO - 108752 EA ID / permit SWS00905 · A00937 Outlet location TQ7563068150 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 0 / 0.0 Long-term average 11.2 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Resolved - Jul Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	River Medway Estuary	1	0.3	up from 0	48%
Sea View Terrace CSO Overflow on sewer network Company site name SEAVIEW TERRACE MARGATE CSO - 107416 EA ID / permit SWS00753 · A00781 Outlet location TR3433070870 (OS grid reference) · View on Apple Maps WFD catchment Kent North (GB650704510000) Bathing water Margate Fulsam Rock; Margate The Bay; St Mildred's Bay, Westgate; Walpole Bay, Margate; West Bay, Westgate; Westbrook Bay, Margate Shellfish water Margate 2024 spills / hours 0 / 0.0 Long-term average 0.6 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	Controlled Sea	1	0.3	up from 0	99%
Leeds WwTW Storm tank at sewage works Sewage works Leeds Company site name LEEDS SSO - 115852 EA ID / permit SWS00498 · A00531 Outlet location TQ8250054030 (OS grid reference) · View on Apple Maps WFD catchment Len (GB106040018430) 2024 spills / hours 28 / 351 Long-term average 24.0 spills a year (monitored since 2016) Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	Tributary of River Len	1	0.3	down 96%	100%
Lower Stone Street Maidstone CSO Overflow on sewer network Company site name LOWER STONE STREET MAIDSTONE CSO - 108870 EA ID / permit SWS00521 · A01433 Outlet location TQ7595055540 (OS grid reference) · View on Apple Maps WFD catchment Len (GB106040018430) 2024 spills / hours 9 / 0.9 Long-term average 11.2 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Resolved - Dec Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	The River Len	1	0.3	down 89%	17%
Melbourne Road Chatham CSO Overflow on sewer network Company site name MELBOURNE ROAD CHATHAM CSO - 108682 EA ID / permit SWS00562 · A00931 Outlet location TQ7563068150 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 1 / 0.1 Long-term average 14.0 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Scheduled Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	River Medway Estuary	2	0.3	up 100%	86%
Upr Shaftesbury Ave Southampton CSO Overflow on sewer network Company site name UPPER SHAFTSBURY AVENUE SOUTHAMPTON CSO - 108792 EA ID / permit SWS00897 · A01295 Outlet location SU4357014560 (OS grid reference) · View on Apple Maps WFD catchment SOUTHAMPTON WATER (GB520704202800) Shellfish water Southampton Water 2024 spills / hours 2 / 1.8 Long-term average 1.6 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	River Itchen	1	0.3	down 50%	100%
North Farm Road Tonbridge Wells CSO Overflow on sewer network Company site name NORTH FARM ROAD TUNBRIDGE WELLS CSO - 108690 EA ID / permit SWS00609 · K02124 Outlet location TQ5943041170 (OS grid reference) · View on Apple Maps WFD catchment Somerhill Stream (GB106040018410) 2024 spills / hours 3 / 1.0 Long-term average 1.3 spills a year (monitored since 2016) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	Tributary of the River Medway	1	0.3	down 67%	99%
Ropetackle Street, Shoreham P.S. Storm discharge at pumping station Company site name ROPETACKLE STREET SHOREHAM CEO - 108324 EA ID / permit SWS00720 · W00432 Outlet location TQ2117005110 (OS grid reference) · View on Apple Maps WFD catchment ADUR (GB540704116000) Bathing water Lancing, Beach Green; Shoreham Beach; Southwick 2024 spills / hours 2 / 0.3 Long-term average 6.0 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	The River Adur (Tidal)	2	0.2	no change	100%
Grove Road Chatham O/S 77 CSO Overflow on sewer network Company site name GROVE ROAD CHATHAM OUTSIDE 77 CSO - 108647 EA ID / permit SWS00372 · A00929 Outlet location TQ7562068140 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 1 / 0.0 Long-term average 1.6 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	River Medway Estuary	1	0.2	no change	100%
Foads Hill Cliffs End CSO Overflow on sewer network Company site name FOADS HILL CLIFFS END CSO - 107353 EA ID / permit SWS00321 · A00430 Outlet location TR3517064090 (OS grid reference) · View on Apple Maps WFD catchment STOUR (KENT) (GB520704004700) Bathing water Ramsgate Sands; Ramsgate Western Undercliffe 2024 spills / hours 0 / 0.0 Long-term average 0.1 spills a year (monitored since 2016) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Pegwell Bay, English Channel	1	0.2	up from 0	98%
North Lane Faversham CSO Overflow on sewer network Company site name NORTH LANE FAVERSHAM CSO - 108691 EA ID / permit SWS00611 · A01339 Outlet location TR0143061570 (OS grid reference) · View on Apple Maps WFD catchment SWALE (GB530604011500) Shellfish water Swale Central; Swale East 2024 spills / hours 0 / 0.0 Long-term average 0.4 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	The Faversham Creek	1	0.2	up from 0	100%
Springvale Wps CSO Storm discharge at pumping station Company site name SPRING VALE CEO - 108560 EA ID / permit SWS00805 · A00770 Outlet location SZ6199092090 (OS grid reference) · View on Apple Maps WFD catchment Solent (GB650705150000) Bathing water Ryde; Seagrove; St Helens Shellfish water Ryde; Spithead and Stokes Bay; Cowes and Medina 2024 spills / hours 2 / 2.8 Long-term average 4.3 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	The Solent	1	0.2	down 50%	100%
Southern Road Pennington CSO Overflow on sewer network Company site name SOUTHERN ROAD PENNINGTON CSO - 108483 EA ID / permit SWS00799 · A00980 Outlet location SZ3148095380 (OS grid reference) · View on Apple Maps WFD catchment Lymington River (GB107042011220) Shellfish water Lymington and Sowley; Pennington 2024 spills / hours 5 / 0.4 Long-term average 0.9 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Buckland Stream	2	0.2	down 60%	100%
Wessex Lane Southampton Outside 11 Overflow on sewer network Company site name WESSEX LANE SOUTHAMPTON OUTSIDE 11 CSO - 108496 EA ID / permit SWS00918 · H01795 Outlet location SU4401015990 (OS grid reference) · View on Apple Maps WFD catchment Monks Brook (GB107042016310) Shellfish water Southampton Water 2024 spills / hours 10 / 1.2 Long-term average 2.1 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Saline Estuary	2	0.2	down 80%	95%
Barker Road Maidstone CSO Overflow on sewer network Company site name BARKER ROAD MAIDSTONE CSO - 108580 EA ID / permit SWS00041 · A01055 Outlet location TQ7576055510 (OS grid reference) · View on Apple Maps WFD catchment Medway at Maidstone (GB106040018440) 2024 spills / hours 1 / 0.2 Long-term average 0.3 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	The River Medway	1	0.1	no change	99%
Castle Hill Rochester CSO Overflow on sewer network Company site name CASTLE HILL ROCHESTER CSO - 109538 EA ID / permit SWS00142 · D00080 Outlet location TQ7410068750 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 1 / 0.1 Long-term average 1.3 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Resolved - Sep Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	The River Medway	1	0.1	no change	62%
Chestnut Avenue Ceo Storm discharge at pumping station Company site name CHESTNUT AVENUE EASTLEIGH CEO - 108412 EA ID / permit SWS00169 · A00202 Outlet location SU4427018170 (OS grid reference) · View on Apple Maps WFD catchment Monks Brook (GB107042016310) 2024 spills / hours 7 / 46 Long-term average 4.0 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	The Monks Brook	2	0.1	down 71%	100%
New Brook Pumping Station Storm discharge at pumping station Company site name NEW BROOK CHATHAM CEO - 108687 EA ID / permit SWS00594 · A00255 Outlet location TQ7563068150 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 4 / 0.4 Long-term average 2.6 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Saline Estuary	2	0.1	down 50%	99%
Salterns Lane Fareham O/S 12 CSO Overflow on sewer network Company site name SALTERNS LANE FAREHAM OUTSIDE 12 CSO - 108850 EA ID / permit SWS00732 · A01380 Outlet location SU5810005200 (OS grid reference) · View on Apple Maps WFD catchment PORTSMOUTH HARBOUR (GB580705140000) Shellfish water Portsmouth Harbour 2024 spills / hours 1 / 2.3 Long-term average 1.2 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 0.1 hours spilling →	The Portsmouth Harbour	1	0.1	no change	100%
Sunnyfield Road Barton-on-Sea CSO Overflow on sewer network Company site name SUNNYFIELD ROAD BARTON ON SEA CSO - 108490 EA ID / permit SWS00840 · A01293 Outlet location SZ2411093750 (OS grid reference) · View on Apple Maps WFD catchment Becton Bunny (GB107042011260) Bathing water Christchurch Bay 2024 spills / hours 0 / 0.0 Long-term average 0.1 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Beckton Bunny	1	0.1	up from 0	94%
Tates Copse PS Storm discharge at pumping station Company site name TATES COPSE HYTHE H CEO - 108492 EA ID / permit SWS00850 · W00230 Outlet location SU4327007120 (OS grid reference) · View on Apple Maps WFD catchment SOUTHAMPTON WATER (GB520704202800) Shellfish water Southampton Water; Approaches to Southampton Water 2024 spills / hours 2 / 0.7 Long-term average 0.4 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Southampton Water	1	0.1	down 50%	100%
Pump Lane Gillingham No.1 CSO Overflow on sewer network Company site name PUMP LANE GILLINGHAM NO 1 CSO - 107446 EA ID / permit SWS00682 · A00467 Outlet location TQ8139067910 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 0 / 0.0 Long-term average 0.5 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Resolved - Jul Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.0 hours spilling →	The River Medway Estuary	1	0.0	up from 0	50%
Kingsmead Road Canterbury CSO Overflow on sewer network Company site name KINGSMEAD ROAD CANTERBURY CSO - 108664 EA ID / permit SWS00480 · NPSWQD008569 Outlet location TR1542058670 (OS grid reference) · View on Apple Maps WFD catchment Great Stour between A2 and West Stourmouth (GB107040019743) 2024 spills / hours 0 / 0.0 Long-term average 0.1 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.0 hours spilling →	Great Stour River	1	0.0	up from 0	93%

Sewage treatment works

Storm tanks and inlet overflows at each Southern Water sewage works. The figures are 2025 spills.

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